CN106838936A - A kind of secondary treatment method of sodium method flue gas desulfurization liquid - Google Patents
A kind of secondary treatment method of sodium method flue gas desulfurization liquid Download PDFInfo
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- CN106838936A CN106838936A CN201710134521.XA CN201710134521A CN106838936A CN 106838936 A CN106838936 A CN 106838936A CN 201710134521 A CN201710134521 A CN 201710134521A CN 106838936 A CN106838936 A CN 106838936A
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- sulfate
- quencher
- gas
- flue gas
- solution
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/04—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste liquors, e.g. sulfite liquors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/10—Liquid waste
- F23G2209/101—Waste liquor
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of secondary treatment method of sodium method flue gas desulfurization liquid, integrated operation step is as follows：Sodium method doctor solution feeding sulfur furnace is burned, the high-temperature gas of generation and a small amount of sulfate carry out rapid cooling by quencher；Gas and sulfate after cooling enter knockout drum after mixing in quencher, sulfate liquor and gas are formed after water vapour condensation, gas after gas-liquid separation is taken away by blower fan, sulfate liquor then through returning to knockout drum by quencher again after the effect of persulfate solution cooler in, circulate operation, until sulfate liquor reaches saturation；Sulfate liquor after saturation is concentrated by sulfate multi-effect evaporating device or MVR vaporising devices, crystallized, and realizes the recycling of waste.Present invention process flow scheme design rationally, has the advantages that good sewage processing effect, recovery utilization rate be high, simple to operate, system run all right is not easily blocked, and is widely portable to the batch production treatment of sodium method flue gas desulfurization liquid.
Description
Technical field
The present invention relates to a kind of processing method, more particularly to a kind of secondary treatment method of sodium method flue gas desulfurization liquid, belong to
Technical field of sewage.
Background technology
Flue gas desulfurization refers to that oxysulfide (predominantly SO is removed from flue gas or other industrial waste gases2And SO3) mistake
Journey.Current up to tens kinds of flue gas desulfurization technique, is broadly divided into by whether sweetening process adds water with the dry and wet form of desulfurization product：
Wet method, semidry method, dry method three major types sulfur removal technology.Wherein, sodium method flue gas desulfurization technique is applied most as in Wet Flue Gas Desulfurization Technique
It is extensive a kind of, has the advantages that desulfuration efficiency is high, simple to operate, it is mainly by the alkaline metal salt aqueous solution, such as
NaOH、Na2CO3、NaHCO3、Na2SO3Deng being absorbed to oxysulfide so that flue gas desulfurization and meeting Air Pollutant Emission
The process of standard.
Although sodium method flue gas desulfurization technique effectively reduces the discharge capacity of toxic gas in flue gas, but the method is absorbing poisonous
Substantial amounts of oxysulfide is still present in the doctor solution produced after gas.Present enterprise is general not to carry out after-treatment just directly
Connect and doctor solution is emitted into environment, greatly pollution and destruction are all brought to ecological environment and drinking water quality.With China
Environmental problem become increasingly conspicuous and sewage drainage standard it is increasingly strict, develop effective sodium method flue gas desulfurization liquid
After-treatment technique is very urgent.
The content of the invention
In order to solve the weak point existing for above-mentioned technology, the invention provides a kind of the secondary of sodium method flue gas desulfurization liquid
Processing method.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of sodium method flue gas desulfurization liquid it is secondary
Processing method, concrete operation step is as follows：
A, will sodium method doctor solution send into sulfur furnace in burned, make the sulfuric acid in sodium method doctor solution at 1000~1200 DEG C
At a high temperature of rapid cleavage, generation include SO2、H2O、N2、O2、CO2、SO3And the high temperature of a small amount of molten state or solid-state sulfate
Furnace gas；
B, high-temperature furnace gas enter quencher under high flow condition, and the temperature of high-temperature furnace gas is made using the architectural characteristic of quencher
Spend moment and be down to less than 70 DEG C；The top of quencher feed tube is reserved with water head tank, and water head tank is provided initially for quencher
Cooling spray liquid and power-off protection；
C, quencher is processed after furnace gas and spray liquid import in knockout drum together, make a large amount of water in furnace gas
Steam, sulfate and SO3All it is dissolved in the aqueous solution in tank, sulfate liquor is formed, while not molten furnace gas is passed through
Blower fan is taken away；
Part of sulfuric acid salting liquid in d, knockout drum is cooled down in being delivered to sulfate liquor cooler；After cooling
Sulfate liquor be back in knockout drum by quencher again, in quencher further absorb vapor, sulfate
And SO3The sulfate circulation solution that concentration gradually rises is formed afterwards；Aforesaid operations are repeated, until sulfate circulation solution reaches
Saturation；
E, the sulfate circulation solution after saturation is carried out by sulfate multi-effect evaporating device or MVR vaporising devices it is dense
Contracting, sulfate circulation solution after concentration further Crystallization Separation, obtains solid sulfate salt.
The not molten furnace gas taken away by blower fan in step c is used to make sulfuric acid or other chemicals workshop sections, or sends to purification
Workshop section carries out deep purifying.
Interlocked control valve is provided between water head tank and quencher, by the control action of interlocked control valve to urgency
The initial spray liquid of input in cooler, and make it to quick supplement cooling water in quencher under quencher failure or off-position
It is unlikely to burn out.
Present invention process flow scheme design rationally, with good sewage processing effect, recovery utilization rate it is high, simple to operate,
The advantage that system run all right is not easily blocked, is widely portable to the batch production treatment of sodium method flue gas desulfurization liquid, so as to safeguard life
The stability of state environment and sustainable development.
Brief description of the drawings
Fig. 1 is general steps schematic flow sheet of the invention.
Fig. 2 is the workflow diagram of sulfate multi-effect evaporating device.
Fig. 3 is the workflow diagram of MVR vaporising devices.
Specific embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
As shown in figure 1, specific steps flow of the invention is as follows：
A, will sodium method doctor solution and air feeding sulfur furnace in carry out high temperature incineration, the sulfuric acid in sodium method doctor solution is existed
Rapid cleavage at a high temperature of 1000~1200 DEG C, generation includes SO2、H2O、N2、O2、CO2、SO3And a small amount of molten state or solid-state
The high-temperature furnace gas of sulfate；
During b, high-temperature furnace gas pass through pipeline to quencher under high flow condition, the architectural characteristic using quencher makes
The temperature moment of high-temperature furnace gas is down to less than 70 DEG C；Quencher is prepared using high strength graphite, and the top of quencher feed tube is pre-
Leave water head tank, water head tank initial cooling spray liquid and power-off protection for quencher is provided；Water head tank and quencher
Between be provided with interlocked control valve, the control action by interlocked control valve to being input into initial spray liquid in quencher, and
To quick supplement cooling water in quencher under quencher failure or off-position, it is set to be unlikely to burn out；
C, lower the temperature through quencher after furnace gas and initial spray liquid import in knockout drum together, make big in furnace gas
Amount vapor, sulfate and SO3All it is dissolved in the aqueous solution in tank, forms sulfate liquor；Knockout drum is by FRP
(fibre reinforced composites) or steel lining graphite or other resistant materials are made, good seal performance, long service life；Together
When by not molten furnace gas (including SO2、H2O、N2、O2、CO2Deng) taken away by blower fan, for making sulfuric acid or other chemicals works
Section, or send to purification section and carry out deep purifying etc..
Part of sulfuric acid salting liquid in d, knockout drum is cooled down in being delivered to sulfate liquor cooler, sulfate
Solution cooler is prepared from using tubulation or block cellular type graphite-structure；Sulfate liquor after cooling is flowed back by quencher again
Into knockout drum, vapor, sulfate and SO are further absorbed in quencher3The sulphur that concentration gradually rises is formed afterwards
Hydrochlorate circulation solution；Aforesaid operations are repeated, until sulfate circulation solution reaches saturation；
E, by the sulfate circulation solution after saturation pass through sulfate multi-effect evaporating device or MVR (mechanical
Vapor recompression, mechanical steam recompression technology) vaporising device concentrated, the sulfate circulation after concentration
Solution further Crystallization Separation, obtains solid sulfate salt.
As shown in Fig. 2 the concrete operations that saturation sulfate circulation solution is concentrated in sulfate multi-effect evaporating device
Process is as follows：
Saturation sulfate circulation solution is delivered in primary heater jointly with vapours and is tentatively heated, then passed through
Gas-liquid separation is carried out in pipeline to primary flash device；The steam isolated enters two by different pipelines respectively from solution
In level heater, wherein steam can tentatively be heated as thermal source to the solution isolated, and the solution after heating is delivered to again
Gas-liquid separation is carried out in two-stage flash device；Sulfate circulation solution after secondary gas-liquid separation again passes by the entrance of three-level heater
In three stages of flashing device, concentration is completed；Sulfate circulation solution after concentration can obtain recyclable profit by operations such as separation, crystallizations
Sulfate solid, and three-level separate after trace acidic steam then with not molten furnace gas SO2、H2O、N2、O2、CO2Deng together
For making sulfuric acid or other chemicals workshop sections, or send to purification section and carry out deep purifying.
Wherein, one-level, two grades, the vacuum of three stages of flashing device in being lifted step by step, be easy to the water in sulfate liquor
Divide the stepped evaporation in flash vessels at different levels, finally give crystallizable, separate sulfate concentrate.Flash vessels at different levels use carbon
Glass-lined steel steel or the corrosion-resistant structures such as graphite cake that are usually coated again are made；Heaters at different levels use tubulation or block cellular type graphite
Structure fabrication is formed.
As shown in figure 3, the specific operation process that saturation sulfate circulation solution is concentrated in MVR vaporising devices is such as
Under：
Saturation sulfate circulation solution carries out store collected first in head tank, then is sequentially sent to preheater, heating steaming
Heated in hair device；Gas phase enters separator after being steamed out from heating evaporation device, and that separates in the separator is big
Amount gas is further delivered in mechanical compressor, and high-grade steam source and again is promoted to through the mechanical work of compressor
Heating evaporation device is acted on, promotes the solution in heating evaporation device to evaporate, form the sulfate concentrate of high concentration；Separator point
The a small amount of solution for separating out then is back in head tank, into next round evaporation process.
In MVR vaporising devices, preheater and heating evaporation device are made by tubulation or block cellular type graphite-structure；Separate
Device serves as a contrast fiberglass using carbon steel or the corrosion-resistant structures such as graphite cake that are usually coated again are made.
Incineration temperature by controlling sulfur furnace of the invention, can make doctor solution rapid cleavage into high-temperature gas and solid-state sulphur
Hydrochlorate, after then being acted on by the rapid cooling of quencher, gas and liquid to being formed are recycled respectively, are had
Have the advantages that technical flow design is reasonable, recovering effect is good, easy to operate, stable.
Above-mentioned implementation method is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
Change, remodeling, addition or replacement that the technical staff in domain is made in the range of technical scheme, also belong to this hair
Bright protection domain.
Claims (3)
1. a kind of secondary treatment method of sodium method flue gas desulfurization liquid, it is characterised in that：The concrete operation step of methods described is as follows：
A, will sodium method doctor solution send into sulfur furnace in burned, make height of the sulfuric acid in sodium method doctor solution at 1000~1200 DEG C
The lower rapid cleavage of temperature, generation includes SO2、H2O、N2、O2、CO2、SO3And the high-temperature furnace gas of a small amount of molten state or solid-state sulfate；
B, high-temperature furnace gas enter quencher under high flow condition, and the temperature wink of high-temperature furnace gas is made using the architectural characteristic of quencher
Between be down to less than 70 DEG C；The top of quencher feed tube is reserved with water head tank, water head tank initial cooling for quencher is provided
Spray liquid and power-off protection；
C, quencher is processed after furnace gas and spray liquid import in knockout drum together, steam a large amount of water in furnace gas
Gas, sulfate and SO3All it is dissolved in the aqueous solution in tank, forms sulfate liquor, while not molten furnace gas is passed through into wind
Machine is taken away；
Part of sulfuric acid salting liquid in d, knockout drum is cooled down in being delivered to sulfate liquor cooler；Sulphur after cooling
Acid salt solution is back in knockout drum by quencher again, in quencher further absorb vapor, sulfate and
SO3The sulfate circulation solution that concentration gradually rises is formed afterwards；Repeat aforesaid operations, until sulfate circulation solution reach it is full
With；
E, the sulfate circulation solution after saturation is concentrated by sulfate multi-effect evaporating device or MVR vaporising devices, it is dense
Sulfate circulation solution after contracting further Crystallization Separation, obtains solid sulfate salt.
2. the secondary treatment method of sodium method flue gas desulfurization liquid according to claim 1, it is characterised in that：In the step c
The not molten furnace gas taken away by blower fan is used to make sulfuric acid or other chemicals workshop sections, or sending to purification section, to carry out depth net
Change.
3. the secondary treatment method of sodium method flue gas desulfurization liquid according to claim 1, it is characterised in that：The water head tank
Interlocked control valve is provided between quencher, by the control action of interlocked control valve to the initial spray of input in quencher
Liquid is drenched, and makes it be unlikely to burn out to quick supplement cooling water in quencher under quencher failure or off-position.
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| CN201710134521.XA CN106838936B (en) | 2017-03-08 | 2017-03-08 | A kind of secondary treatment method of sodium method flue gas desulfurization liquid |
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|---|---|---|---|
| CN201710134521.XA CN106838936B (en) | 2017-03-08 | 2017-03-08 | A kind of secondary treatment method of sodium method flue gas desulfurization liquid |
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| CN106838936A true CN106838936A (en) | 2017-06-13 |
| CN106838936B CN106838936B (en) | 2018-12-11 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003232511A (en) * | 2002-02-06 | 2003-08-22 | Tsukishima Kikai Co Ltd | Combustion method and combustion apparatus for waste liquid |
| CN201246751Y (en) * | 2008-04-29 | 2009-05-27 | 北京航天石化技术装备工程公司 | Waste liquid and waste gas containing chlorine non-pollution processing device |
| CN103292332A (en) * | 2013-05-27 | 2013-09-11 | 北京航天动力研究所 | Negative-pressure incineration disposal system and negative-pressure incineration disposal method for fluorine-containing organic waste liquid and exhaust gas |
| CN204460235U (en) * | 2015-01-27 | 2015-07-08 | 北京华电光大装备技术有限公司 | A kind for the treatment of apparatus for chloride salty organic waste liquid |
-
2017
- 2017-03-08 CN CN201710134521.XA patent/CN106838936B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003232511A (en) * | 2002-02-06 | 2003-08-22 | Tsukishima Kikai Co Ltd | Combustion method and combustion apparatus for waste liquid |
| CN201246751Y (en) * | 2008-04-29 | 2009-05-27 | 北京航天石化技术装备工程公司 | Waste liquid and waste gas containing chlorine non-pollution processing device |
| CN103292332A (en) * | 2013-05-27 | 2013-09-11 | 北京航天动力研究所 | Negative-pressure incineration disposal system and negative-pressure incineration disposal method for fluorine-containing organic waste liquid and exhaust gas |
| CN204460235U (en) * | 2015-01-27 | 2015-07-08 | 北京华电光大装备技术有限公司 | A kind for the treatment of apparatus for chloride salty organic waste liquid |
Non-Patent Citations (1)
| Title |
|---|
| 魏绍东等: ""钛白废酸的治理与浓缩综述"", 《无机盐工业》 * |
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